Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Sei H Ahn MD

Obstetrics & Gynecology Physician in Wilmington, DE · enumerated 2007 · authorized official Sei Ahn, Owner.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1801941158

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Registry record

Entity type Organization (Type 2)

Legal business name Sei H Ahn MD

Practice address 2601 Annand Dr, Suite 14, Wilmington, DE, 19808

Phone (302) 633-9049

Fax (302) 633-9058

Enumeration date Jan 25, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License C10001503 (DE) Primary

Authorized official

Name Sei Ahn

Title Owner

Phone (302) 633-9043

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Sei H Ahn MD located?

The practice location on file with NPPES is in Wilmington, DE.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2020-08-22. Verify at npiregistry.cms.hhs.gov.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.